Power Meters / Powermeters (SRM, Powertap, Quarq, Ergomo, Vector, Stages, power2max, P2M, 4iii, InPower, Cinch)

It really doesnt look like an aero ring will fit, because the battery thing goes out where the chainring would be

Cheers for looking, I've had a read through PDF I linked to and come out pretty confident that the whole battery assembly is removable (screw under battery)

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Ah bollocks and just as I post that I see the warning at the top saying not to remove it on dzero

I think it would still be a problem to fit the aero rings, this is what it looks like under the battery.
The PM does look good with the non-aero rings too imo

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Thanks @Carlooooo
You're right, they look fine just frustrated that I need to shop more!
Found an email for quarq yesterday and they confirmed the same thing

SRAM have just returned (via Wiggle) the Riken power meter I bought in 2013 fresh from its warranty refresh. It went kaput in 2015, just inside the 2 year warranty period, so they replaced the spider. In went kaput again earlier this year, but it turns out that you get a new 2 year warranty period if the spider is replaced. Which is nice. What's even nicer is they've fitted an Elsa spider to replace the dead Riken one. Although curiously they haven't refitted the chainrings, which is rather odd.

If history is anything to go by, the Elsa spider will die some time in Spring 2019.

An added bonus of normal chainrings is that it makes cleaning you bike slightly easier :)

I just cut off a bit of my q ring and it works fine on the 110 bcd dzero spider. Just make sure you know what position you want it in as there's no going back after the snip.

looking at solving 2 problems in one (I don't like changing powermeters between bikes and im one rear wheel short) with a second hand powertap pro 32 laced to a mavic open pro.

is there any advice on making sure i'm not buying a dud?

I assume you're not buying in person? Get the seller to take a photo of the calibration results when calibrated the PM on their Garmin.

will be picking it up, presume I should take a garmin and calibrate it, what should I be looking for?

Yeah, I would. It should return a current calibration value around 512, with a torque reading as close to zero as possible.

is 521 ok or should run a mile?

Looking for a powermeter that I can swap between bikes - have different wheels, so not keen on hub powermeters.

A p2m type s to fit my rotor 3D crank is 550 euros. I had a quarq cinqo previously and found swapping the rotor crank to be a 2 minute job.

The power tap pedals look interesting but double the price (and I have some concern about damage to pedal based meters)

Leaning towards the p2m but anything I should consider? One bike has a rotor 3D, the other a record crank, both 24mm English. And, I use Q rings on both fwiw

After a bit of advice about crankset powermeters.

I've thought about a PM for a while and thought about replacing my existing Ultegra 6800 cranks and going for a crankset-based PM.

Current thoughts are Power2Max NG (with Rotor) or Quarq Dzero 91 (I can get this sent to Japan sans VAT from PowerMeter24).

Anyone have any views on these, or other options?

Edit: I've already looked through the thread and at a lot of online resources - I'm more interested in person experience.

I have a dfour which is a dzero for shimano rings, very happy with it, it has been consistent and easy to use, which is all you can ask for really, the fact I can use shimano rings is nice but I could live without it.

Thanks for that.

I had actually mistyped and meant the DFour91!

My friend got the SRAM version and swears by it, so that's where I'm leaning (if I pony up and go down the PM route).

I had a Quarq Riken for 2 years that never missed a beat

I've had a power2max and a Quarq and would recommend both. Both are really simple to set up and are reliable with good battery life.

Thanks for the input, all.

Unless I'm missing something, the DFour91 appears almost unchanged from the DFour (despite being 'new')?

I can see they say that they haven't tested R8000 rings with it, but it appears academic...

Go with whichever one you can get a price on IMO. Consider the P2m type S too. It's on discount at the moment, 540 euro.

That had crossed my mind.

The USB charging of the NG is attractive, as well as another few bits that've been updated. However, the Type S is a good price now.

The only issue with P2M is getting them to Japan (not as many online retailers, etc.).

They sell direct. That's their model.

I see.

Unfortunately, living here means that all direct sellers add massive premiums to all cycling products, making it often over double the price you'd pay in Europe for the same product. Even after 3 years, I'm unsure why; it's definitely not down to import taxes, as these are relatively low.

P2M's direct distributorshere DEFINITELY won't sell at the discounted price, so it'll probably now be that Quarq is the way forward.

It doesn't look like they do trade direct in Japan. There's a middleman, Zeta Trading..

@xDOMx Get it sent to a Europe address then get them to forward it on to Japan